JPH0134031Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a solar water heater having a hot water storage tank and a heat collector.

Configuration of a conventional example and its problems A conventional example of a solar water heater that has a heat transfer path using a compressor and uses an evaporator as a heat collector will be described below.

In FIGS. 1 and 2, a circulation path 6 passes through a water outlet 2 at the bottom of the hot water storage tank 1, a circulation pump 3, a heat exchanger 4, and an inlet 5 at the top of the hot water storage tank 1.
On the other hand, a heat transfer path via a heat exchanger 4, an expansion valve 7, an evaporator 8, and a compressor 9 is formed. The evaporator 8 is equipped with a heat transfer path 10 and a heat collection fin 11, and these parts are fixed to a frame 12 and a lid 13 to serve as a heat collector, and installed outdoors such as on a roof to absorb solar heat (solar radiation). By operating the compressor 9, the water is guided to the heat exchanger 4, where it exchanges heat and can convert water into hot water. The water in the hot water storage tank 1 can be boiled up to approximately 55℃, and its boiling efficiency COP (coefficient of product) reaches 4, which is extremely high compared to general heating element electric water heaters. The present invention provides a water heater that is highly energy-saving. Although not shown, the circulation pump 3 and compressor 9 are electrically connected and are a system that absorbs solar heat to heat water, so a timer (not shown) is set to operate only during the day from 8:00 AM.
The power is controlled to be turned on only between 4:00 PM.
When the power supply is started at 8:00 AM, the circulation path 6 and the heat transfer path 10 circulate water and refrigerant in the direction of the arrow.
The heat-exchanged water flows into the hot water storage tank 1 from the inlet 5 and this cycle is repeated, and the hot water is gradually stored in the tank 1. When the control sensor (not shown) reaches approximately 55°C, the circulation pump 3 and The power supply to the compressor 9 is stopped and boiling is completed. At this time, if the time has not reached 4:00 PM, even if hot water is supplied from the water inlet, the boiling operation will be automatically performed by the action of the control sensor.

However, since the power supply time is controlled by a timer, the power supply is set to start at 8:00 AM.
While using it for a long time, it sometimes became late or early, and since it was set at one point at 8:00 AM, it became impossible to get effective sunlight when the power was turned on due to seasonal changes.

In other words, in order to operate with high efficiency, it is necessary to operate while effectively receiving solar radiation, but despite this, due to the delay or advance of the set time, operation may start from a time when no solar radiation is received. Or, the operation may be stopped even though there is effective solar radiation. This also occurs due to seasonal changes, as the sunrise time differs depending on the season, and as a result, the water temperature does not rise even though it uses electricity, so there is no wastage of electricity. There is a problem in that boiling is not completed during the daytime when solar radiation occurs and effective solar radiation is received.

Purpose of the invention In view of the above-mentioned problems, the present invention maintains high boiling efficiency by always operating the equipment while receiving effective solar radiation, regardless of seasonal changes or changes in the external environment, thereby reducing waste of electricity. The object of the present invention is to provide a water heater that can eliminate the problem of insufficient boiling water.

Structure of the Invention In order to achieve the above object, the present invention has a solar radiation detection sensor attached to the solar radiation receiving surface side of the heat collector.

With the above configuration, regardless of seasonal changes or changes in the external environment, the equipment can always operate under effective solar radiation, maintaining high boiling efficiency, eliminating wasteful electricity, and preventing insufficient boiling. can also be resolved.

DESCRIPTION OF EMBODIMENTS One embodiment will be described below based on the drawings. The water heater system is similar to that shown in FIG. A sunlight detection sensor 14 is provided on the lid 13 on the side of the heat collector 8 that receives sunlight, and this sunlight detection sensor 14 is electrically connected to the circulation pump 3 and the compressor 9, so that the outdoor illuminance in the morning is approximately 500. It has an electric circuit that sends a signal to start energizing the circulation pump 3 and compressor 9 when the ambient light level reaches 500 lux, and sends a signal to stop energizing when the outdoor illuminance reaches about 500 lux in the evening.

Therefore, the conventional timer control circuit is not retained. With the above configuration, energization is controlled according to the outdoor illuminance and boiling is performed in the same manner as before, so the start of energization and the solar radiation are always linked, so there is no need to worry about seasonal changes or time delays. Lack of operating time and conversely loss of operation are eliminated, and energy-saving operation can be performed with high efficiency at all times, and the problem of insufficient boiling can also be eliminated. Also, sunlight detection sensor 1
By attaching the sensor 4 to the heat collector 8, the sunlight detection sensor 14 can accurately grasp the environment of the heat collector. In other words, it is possible to install the sunlight detection sensor 14 outdoors under the eaves or around the equipment, but in this case, the sunlight detection sensor 14 may be unconsciously covered or placed in the shade of another building. Therefore, accurate illuminance cannot be determined, resulting in the same problem as the conventional method. Therefore, by installing it in this way, accurate energy-saving operation becomes possible regardless of changes in the external environment.

Effects of the invention According to the invention, regardless of seasonal changes or changes in the external environment, equipment is always operated with effective solar radiation, maintaining high boiling efficiency, eliminating waste of electricity, and boiling. There will be no shortage.

In addition, the sunlight detection sensor is installed on the lid, where the temperature is stable, and not on the heat collection plate, where the temperature changes rapidly, so it is possible to control the heat collection with excellent durability and reliability for long-term use.

Furthermore, the sunlight detection sensor can be securely mounted on the lid, which can withstand heavy wind and rain, and does not require any troublesome angle adjustment.
Anyone can easily install it in the best condition.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a conventional example, and FIG. 2 is a perspective view showing an embodiment of the present invention. 1...Hot water storage tank, 3...Circulation pump, 4...
Heat exchanger, 8... Heat collector, 9... Compressor, 14...
...Sunlight detection sensor.

Claims (1)

[Scope of utility model registration request] An expansion valve is provided at the refrigerant inlet and outlet of the collector, which is an open-type evaporator consisting of heat collection fins and a heat transfer path fixed to a frame.By storing this expansion valve with a lid, it is almost the same as the solar radiation receiving surface. A solar water heater that forms an inclined plane, has a sunlight detection sensor on the surface of the lid that detects sunlight, and controls the start and stop of a compressor and circulation pump based on the signal from the sunlight detection sensor.